Biology, Eighth Edition (Raven)

Chapter 6: Energy and Metabolism

Pre Test

Which of the following is the most comprehensive definition of "energy"? (p. 106)
A)The ability to make high-energy compounds.
B)The capacity to do work.
C)Changes in the amount of heat in a system.
D)Potential power.
E)Movement of molecules within a system.
How does a catalyst assist a chemical reaction? (p. 109)
A)It allows the reaction to release more energy upon completion.
B)It adds more energy to the reactant so it can achieve an unstable state, thus exceeding the activation energy demand.
C)It provides an alternative method for the reaction to occur which is more energetically favorable than would occur without the catalyst.
D)It converts a nonspontaneous (endergonic) reaction to a spontaneous one (exergonic).
E)It allows the second law of thermodynamics to be reversed.
True or False: ATP is a nucleotide. (p. 110)
Which of the following is MOST likely to affect the efficiency (activity) of an enzymatic reaction? (p. 114)
A)Changes in temperature
B)Feedback inhibition
C)Absence of cofactors such as metal ions in the active site
D)All of the above affect enzyme activity
E)None of the above affect enzyme activity
How might a membrane improve the efficiency of an enzymatic pathway? (p. 115)
A)It creates order in what is otherwise a highly disordered cytoplasm.
B)It can orient active sites of enzymes in the same pathway towards a chamber containing the reactants.
C)It increases the amount of entropy in the reaction, giving the overall reaction a more negative ΔG value.
D)It decreases the activation energy of all the enzymatic catalysts by an equal amount.
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